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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | $ 271,276 | $ 251,120
Unrealized Gains | 6,810 | 7,695
Unrealized Losses | 527 | 309
Fair Value | 277,559 | 258,506
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 49,562 |
Twelve Months or More, Fair Value | 603 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 511 |
12 Months or Longer, Unrealized Losses | 16 |
U.S. Treasury Notes [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 19,447 | 18,462
Unrealized Gains | 246 | 224
Unrealized Losses | 0 | 0
Fair Value | 19,693 | 18,686
US Agency Notes [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 100,668 | 89,372
Unrealized Gains | 1,021 | 1,364
Unrealized Losses | 190 | 130
Fair Value | 101,499 | 90,606
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 23,040 |
Twelve Months or More, Fair Value | 0 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 190 |
12 Months or Longer, Unrealized Losses | 0 |
US Agency Mortgage-Backed Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 53,116 | 51,121
Unrealized Gains | 1,166 | 1,444
Unrealized Losses | 126 | 24
Fair Value | 54,156 | 52,541
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 11,255 |
Twelve Months or More, Fair Value | 0 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 126 |
12 Months or Longer, Unrealized Losses | 0 |
Certificates of Deposit with Other Banks [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 1,494 |
Unrealized Gains | 15 |
Unrealized Losses | 0 |
Fair Value | 1,509 |
Corporate Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost |  | 3,032
Unrealized Gains |  | 35
Unrealized Losses |  | 0
Fair Value |  | 3,067
Non-Taxable Municipal Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 75,766 | 70,504
Unrealized Gains | 3,157 | 3,497
Unrealized Losses | 179 | 119
Fair Value | 78,744 | 73,882
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 13,130 |
Twelve Months or More, Fair Value | 453 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 178 |
12 Months or Longer, Unrealized Losses | 1 |
Taxable Municipal Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 16,684 | 14,851
Unrealized Gains | 919 | 993
Unrealized Losses | 11 | 3
Fair Value | 17,592 | 15,841
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 1,922 |
Twelve Months or More, Fair Value | 0 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 11 |
12 Months or Longer, Unrealized Losses | 0 |
Mutual Funds [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 2,201 | 2,138
Unrealized Gains | 22 | 30
Unrealized Losses | 0 | 0
Fair Value | 2,223 | 2,168
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 57 |
Twelve Months or More, Fair Value | 0 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 0 |
12 Months or Longer, Unrealized Losses | 0 |
Trust Preferred Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 149 | 250
Unrealized Gains | 3 | 2
Unrealized Losses | 4 | 7
Fair Value | 148 | 245
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 47 |
Twelve Months or More, Fair Value | 49 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 3 |
12 Months or Longer, Unrealized Losses | 1 |
Equity Securities [Member] |  |
Available-for-sale investment securities [Abstract] |  |
Amortized Cost | 1,751 | 1,390
Unrealized Gains | 261 | 106
Unrealized Losses | 17 | 26
Fair Value | 1,995 | 1,470
Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than Twelve Months, Fair Value | 111 |
Twelve Months or More, Fair Value | 101 |
Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 3 |
12 Months or Longer, Unrealized Losses | $ 14 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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